Support full pipeline for basic kotlinx.serialization case:

FIR frontend and IR backend plugins.

Note: IR plugin is now broken for old FE, fixed in subsequent commits

plugins/atomicfu/atomicfu-compiler/src/org/jetbrains/kotlinx/atomicfu/compiler/backend/TransformerUtil.kt

@@ -294,6 +294,7 @@ internal fun IrPluginContext.getArrayConstructorSymbol(
 ): IrConstructorSymbol {
     val jsArrayName = irType.getArrayClassFqName()
     return try {
+        @Suppress("DEPRECATION") // caution: referenceConstructors(fqName) doesn't work with FIR
         referenceConstructors(jsArrayName).single(predicate)
     } catch (e: RuntimeException) {
         error("Array constructor $jsArrayName matching the predicate was not found in the context")